I have found that since I'm an easily distracted driver - I can only listen to audiobooks that I have read before or that are in the same series. Brand new stuff distracts me too much and I'm soon driving in the wrong direction. But I've found audiobooks and their talented readers can bring parts of the book alive in ways that you did not notice while reading it.
What about reading e-books? Does it bring a new dimension to your book, or does the "how far you are in the book" bar distract from the enjoyment? Or is the reality just that it allows you to get a book and get it now!?
How do you read? Different genres or titles in different formats? Or a little bit of everything?